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x: 2 - 48 = 8
x : 2 = 8 + 48
x = 56 . 2
x= 112
verificación
reemplazamos la x por el valor hallado
112 : 2 = 56
56 - 48 = 8
20 : 4 + 3x = 59
5 + 3x = 59
3x = 59 - 5
x = 54 : 3
x = 18
verificación
5 + 3 * 18 = 59